Before you waste any more time & ammunition, get that rifle zeroed.
The sights ARE adjustable.
The rear sight is adjustable for elevation by moving the notched elevator ramp backward or forward & resting the sight itself on whichever notch elevation puts the bullet at point of aim at whatever distance you're shooting.
The rear can also be tapped left or right in its dovetail to correct for windage.
Your 25-yard groups are actually poor, and I don't say that to be critical, but to give you a frame of reference.
Find a bench rest & sight the gun in at 25 yards. If you don't have the gun correctly zeroed, you don't know if errors are yours or its.
If you can't find a bench where you can do that, figure out some way to shoot the gun with it and you fully supported, to remove your "wandering" when you aim & fire.
Once you get the gun zeroed, you can move on & work on your technique.
It's best to start your shooting from a benchrest sitting position.
Prone is not the way to start out.
You need to learn the basics of sight picture, breathing, and trigger control first, and then branch out to other positions. AFTER zeroing the gun.
Shooting from a position that reduces your tendency to wobble removes distractions & creates a more consistently stable shooting platform while you learn the basics.
Use a 25-yard standard rimfire pistol black bull's-eye target (you can order from Amazon.com if not available locally) at 25 yards, for your initial rifle work.
Or, the equivalent of the same size in one of the Shoot'n See types that registers hits more visibly.
Don't mess with prone, ground sitting, free-standing, or other field positions till you've learned the basics & figured the gun out. Those can come later. Don't get ahead of yourself.
Last edited by DPris; August 9, 2013 at 02:39 PM.